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Power, instantaneous

The Power, instantaneous component computes the three-phase instantaneous active power P (in watts) and reactive power Q (in vars) associated with a periodic set of three-phase voltages and currents. 

The output signal Q(t) is accurate only for balanced and harmonic-free three-phase voltages and currents.

The output is held constant to the specified Initial active power and Initial reactive power values for one cycle of the specified fundamental frequency.

Symbol

Mask Parameters

NameDescriptionUnitVariable = {Possible Values}
DescriptionUse this field to add all kinds of information about the component
Description = {'string'}
Fundamental frequencyFundamental frequency used for the calculation of the active power (P) and the reactive power (Q). This value cannot be modified during the simulationHzFnom = { [0, 1e12] }
Initial active power
Initial active power value of the magnitude of the output signal for the first simulation cycle. This value cannot be modified during the simulationWPinst_init = { [-1e64 1e64] }
Initial reactive power
Initial reactive power value of the magnitude of the output signal for the first simulation cycle. This value cannot be modified during the simulationVarQinst_init = { [-1e64 1e64] }

Input/Output Signals

Name

Description

Type

Vabc

Vectorized signal containing phase-to-ground voltages (Va, Vb and Vc)

Input

Iabc

Vectorized signal containing phase-to-ground currents (Ia, Ib and Ic)

Input

Pinst

Signal containing the instantaneous active power resulting from the voltage and current signals

Output

Qinst

Signal containing the instantaneous reactive power resulting from the voltage and current signals

Output

Sensor Descriptions

Name

DescriptionUnit

Vabc[a]

Signal containing the voltage of the phase AV

Vabc[b]

Signal containing the voltage of the phase BV

Vabc[c]

Signal containing the voltage of the phase CV

Iabc[a]

Signal containing the current of the phase AA

Iabc[b]

Signal containing the current of the phase BA

Iabc[c]

Signal containing the current of the phase C

A

Pinst

Signal containing the instantaneous active power resulting from the voltage and current signals

W

Qinst

Signal containing the instantaneous reactive power resulting from the voltage and current signals

Var

Internal Circuit of the Component

Example Model

This example demonstrates the usage of Instantaneous power block. A 3-phase 240V, 60Hz source connected to a 3kW and 0.6kVar load is demonstrated.

Note that the following demo requires that users edit the ScopeView template, and replace the existing .oprec data source with the data generated during the simulation.

Simulation results

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